#include<stdio.h>
#include<math.h>
void sort(int *a, int *b, int *c)
{
    int min = *a, max = *a;
    int sum = *a+*b+*c;
    min = (min < *b) ? min : *b;
    min = (min < *c) ? min : *c;
    max = (max > *b) ? max : *b;
    max = (max > *c) ? max : *c;
    *a = min;
    *c = max;
    *b = sum - min - max;
}
int main()
{
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    sort(&a, &b, &c);
    if(a+b>c)
    {
        if(a*a+b*b==c*c) printf("Right triangle\n");
        else if(a*a+b*b>c*c) printf("Acute triangle\n");
        else if(a*a+b*b<c*c) printf("Obtuse triangle\n");
        
        if(a==b||b==c||a==c) printf("Isosceles triangle\n");
        if(a == c) printf("Equilateral triangle\n");
    }
    else printf("Not triangle\n");
    return 0;
}